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A295560 Same as A161644 except that triangles must always grow outwards. 4
0, 1, 4, 10, 16, 22, 34, 52, 64, 70, 82, 100, 118, 136, 166, 208, 232, 238, 250, 268, 286, 304, 334, 376, 406, 424, 454, 496, 538, 580, 646, 736, 784, 790, 802, 820, 838, 856, 886, 928, 958, 976, 1006, 1048, 1090, 1132, 1198, 1288, 1342, 1360, 1390, 1432, 1474 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

REFERENCES

R. Reed, The Lemming Simulation Problem, Mathematics in School, 3 (#6, Nov. 1974), front cover and pp. 5-6. [Describes the dual structure where new triangles are joined at vertices rather than edges.]

LINKS

Lars Blomberg, Table of n, a(n) for n = 0..10000

R. Reed, The Lemming Simulation Problem, Mathematics in School, 3 (#6, Nov. 1974), front cover and pp. 5-6. [Scanned photocopy of pages 5, 6 only, with annotations by R. K. Guy and N. J. A. Sloane]

N. J. A. Sloane, Illustration of first 7 generations of A161644 and A295560 (edge-to-edge version)

N. J. A. Sloane, Illustration of first 11 generations of A161644 and A295560 (vertex-to-vertex version) [Include the 6 cells marked x to get A161644(11), exclude them to get A295560(11).]

N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS

CROSSREFS

Cf. A161644, A161645.

Partial sums of A295559.

Sequence in context: A016957 A109273 A294636 * A161644 A215032 A294980

Adjacent sequences:  A295557 A295558 A295559 * A295561 A295562 A295563

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Nov 27 2017

EXTENSIONS

Terms a(18) and beyond from Lars Blomberg, Dec 20 2017

STATUS

approved

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Last modified November 13 04:20 EST 2019. Contains 329085 sequences. (Running on oeis4.)